Gas tank leak/gas smell

I posted earlier about the gas smell and the noticeable gas stain down the side of the gas tank on our 2004 Winnebago Itasca. Thank you for all your responses!!!! The leak is definitely from the top of the gas tank down the side of the tank- not a big leak at all. However, as we drive from Big Timber, MT toward Bismarck, ND the smell of gas inside the rig is becoming VERY strong. I am letting the gas tank drop way below half, I started this morning with 7/8 tank in Big Timber and think the high level in the tank allowed the gas to slosh around.

Anyway, this appears to be something that cannot wait until we get home in Nevada in 5 weeks. So I am wondering if anyone can recommend someone good in Bismarck that can drop a gas tank and repair what needs to be done.

Thanks in advance for your help.
Steve